{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "import sys\n",
    "\n",
    "sys.path.append('../utils')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "from aoc import * # get_input, d4, d8, d4n\n",
    "from collections import *"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "YEAR = 2021\n",
    "DAY = 20"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [],
   "source": [
    "sample = '''..#.#..#####.#.#.#.###.##.....###.##.#..###.####..#####..#....#..#..##..###..######.###...####..#..#####..##..#.#####...##.#.#..#.##..#.#......#.###.######.###.####...#.##.##..#..#..#####.....#.#....###..#.##......#.....#..#..#..##..#...##.######.####.####.#.#...#.......#..#.#.#...####.##.#......#..#...##.#.##..#...##.#.##..###.#......#.#.......#.#.#.####.###.##...#.....####.#..#..#.##.#....##..#.####....##...##..#...#......#.#.......#.......##..####..#...#.#.#...##..#.#..###..#####........#..####......#..#\n",
    "\n",
    "#..#.\n",
    "#....\n",
    "##..#\n",
    "..#..\n",
    "..###'''"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "scrolled": true
   },
   "outputs": [],
   "source": [
    "inp = get_input(YEAR, DAY)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [],
   "source": [
    "def do_transform(inp):\n",
    "    return list(filter(lambda x: len(x) > 0, inp.split('\\n')))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [],
   "source": [
    "sample = do_transform(sample)\n",
    "inp = do_transform(inp)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [],
   "source": [
    "def solve(inp, k):\n",
    "    assert(k % 2 == 0)\n",
    "    \n",
    "    alg = inp[0]\n",
    "    pic = inp[1:]\n",
    "    d = defaultdict(lambda: '.')\n",
    "    n = len(pic)\n",
    "    m = len(pic[0])\n",
    "    for i in range(n):\n",
    "        for j in range(m):\n",
    "            d[(i, j)] = pic[i][j]\n",
    "            \n",
    "    for _ in range(k):\n",
    "        nd = defaultdict(lambda: '.')\n",
    "        for i in range(-2 * k, n + 2 * k):\n",
    "            for j in range(-2 * k, m + 2 * k):\n",
    "                it = 8\n",
    "                val = 0\n",
    "                for di in range(-1, 2):\n",
    "                    for dj in range(-1, 2):\n",
    "                        ni, nj = i + di, j + dj\n",
    "                        if (ni, nj) in d and d[(ni, nj)] == '#':\n",
    "                            val += 1 << it\n",
    "                        it -= 1\n",
    "                nd[(i, j)] = alg[val]\n",
    "        d = nd\n",
    "        \n",
    "    return len([key for key in d if d[key] == '#' and -k <= key[0] <= n + k - 1 and -k <= key[1] <= m + k - 1])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [],
   "source": [
    "def part1(inp):\n",
    "    return solve(inp, 2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "35"
      ]
     },
     "execution_count": 10,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "part1(sample)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "5249"
      ]
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "part1_ans = part1(inp)\n",
    "part1_ans"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "submit_answer(part1_ans, YEAR, DAY)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [],
   "source": [
    "def part2(inp):\n",
    "    return solve(inp, 50)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "3351"
      ]
     },
     "execution_count": 13,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "part2(sample)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "part2_ans = part2(inp)\n",
    "part2_ans"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "submit_answer(part2_ans, YEAR, DAY, level=2)"
   ]
  }
 ],
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   "title_cell": "Table of Contents",
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